Issue 36, 2015

Formation of long single quantum dots in high quality InSb nanowires grown by molecular beam epitaxy

Abstract

We report on realization and transport spectroscopy study of single quantum dots (QDs) made from InSb nanowires grown by molecular beam epitaxy (MBE). The nanowires employed are 50–80 nm in diameter and the QDs are defined in the nanowires between the source and drain contacts on a Si/SiO2 substrate. We show that highly tunable QD devices can be realized with the MBE-grown InSb nanowires and the gate-to-dot capacitance extracted in the many-electron regimes is scaled linearly with the longitudinal dot size, demonstrating that the devices are of single InSb nanowire QDs even with a longitudinal size of ∼700 nm. In the few-electron regime, the quantum levels in the QDs are resolved and the Landé g-factors extracted for the quantum levels from the magnetotransport measurements are found to be strongly level-dependent and fluctuated in a range of 18–48. A spin–orbit coupling strength is extracted from the magnetic field evolutions of a ground state and its neighboring excited state in an InSb nanowire QD and is on the order of ∼300 μeV. Our results establish that the MBE-grown InSb nanowires are of high crystal quality and are promising for the use in constructing novel quantum devices, such as entangled spin qubits, one-dimensional Wigner crystals and topological quantum computing devices.

Graphical abstract: Formation of long single quantum dots in high quality InSb nanowires grown by molecular beam epitaxy

Article information

Article type
Communication
Submitted
26 iyn 2015
Accepted
13 avq 2015
First published
19 avq 2015
This article is Open Access
Creative Commons BY license

Nanoscale, 2015,7, 14822-14828

Formation of long single quantum dots in high quality InSb nanowires grown by molecular beam epitaxy

D. Fan, S. Li, N. Kang, P. Caroff, L. B. Wang, Y. Q. Huang, M. T. Deng, C. L. Yu and H. Q. Xu, Nanoscale, 2015, 7, 14822 DOI: 10.1039/C5NR04273A

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